EP3351674B1 - Wäschepflegegerät mit einer steuerung - Google Patents

Wäschepflegegerät mit einer steuerung Download PDF

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Publication number
EP3351674B1
EP3351674B1 EP18150541.3A EP18150541A EP3351674B1 EP 3351674 B1 EP3351674 B1 EP 3351674B1 EP 18150541 A EP18150541 A EP 18150541A EP 3351674 B1 EP3351674 B1 EP 3351674B1
Authority
EP
European Patent Office
Prior art keywords
pump
speed
variable
washing liquid
minimum
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP18150541.3A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3351674A1 (de
Inventor
Adrian Alarcon
Rodrigo FERRAZ MAINA
Raymond Römer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BSH Hausgeraete GmbH
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BSH Hausgeraete GmbH
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Filing date
Publication date
Application filed by BSH Hausgeraete GmbH filed Critical BSH Hausgeraete GmbH
Publication of EP3351674A1 publication Critical patent/EP3351674A1/de
Application granted granted Critical
Publication of EP3351674B1 publication Critical patent/EP3351674B1/de
Active legal-status Critical Current
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Classifications

    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F39/00—Details of washing machines not specific to a single type of machines covered by groups D06F9/00 - D06F27/00 
    • D06F39/08—Liquid supply or discharge arrangements
    • D06F39/083—Liquid discharge or recirculation arrangements
    • D06F39/085—Arrangements or adaptations of pumps
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F33/00—Control of operations performed in washing machines or washer-dryers 
    • D06F33/30—Control of washing machines characterised by the purpose or target of the control 
    • D06F33/32—Control of operational steps, e.g. optimisation or improvement of operational steps depending on the condition of the laundry
    • D06F33/36—Control of operational steps, e.g. optimisation or improvement of operational steps depending on the condition of the laundry of washing
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/02—Characteristics of laundry or load
    • D06F2103/04—Quantity, e.g. weight or variation of weight
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/14—Supply, recirculation or draining of washing liquid
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/18—Washing liquid level
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/42—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers related to filters or pumps
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/44—Current or voltage
    • D06F2103/48—Current or voltage of the motor driving the pump
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/06—Recirculation of washing liquids, e.g. by pumps or diverting valves
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/08—Draining of washing liquids
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F39/00—Details of washing machines not specific to a single type of machines covered by groups D06F9/00 - D06F27/00 
    • D06F39/08—Liquid supply or discharge arrangements
    • D06F39/081—Safety arrangements for preventing water damage
    • D06F39/082—Safety arrangements for preventing water damage detecting faulty draining operations, e.g. filter blockage, faulty pump
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F39/00—Details of washing machines not specific to a single type of machines covered by groups D06F9/00 - D06F27/00 
    • D06F39/08—Liquid supply or discharge arrangements
    • D06F39/087—Water level measuring or regulating devices

Definitions

  • the present invention relates to a laundry care device with a controller.
  • washing liquid is pumped out of a tub of the laundry care device by a pump.
  • the pump sucks in air, whereby the pump is ventilated on the suction chamber and pressure chamber side.
  • the ventilated pump In order that a ventilated pump can build up a volume flow of pumped washing liquid again, the ventilated pump must displace air on the suction side and pressure side. Since a vortex, induced by the impeller rotation of the pump, is formed in the inflow of the pump on the suction side, which can prevent a renewed inflow of the pump, this can lead to a backlog of washing liquid in the tub.
  • Rotation of the laundry drum in the laundry care device can be restricted by backed up washing liquid in the tub, because the laundry drum then rotates with higher drive torques in the washing liquid of the backlog amount and this backlog amount is then also set in rotation in the tub.
  • EP 2 993 262 A1 discloses a method of washing laundry in a washing machine.
  • WO 2014/097251 A1 discloses a method of controlling pumping out of washing liquid in a washing machine.
  • EP 2 428 608 A1 discloses a method for operating a pump of a washing machine, wherein the delivery rate, pump speed and pump direction of rotation of the pump can be varied as a function of the detected level of the washing liquid and its density in a treatment tank.
  • the object on which the invention is based is to specify a laundry care device in which an effective pumping of washing liquid from a tub of the laundry care device is ensured.
  • the object of the invention is provided by a laundry care device with a tub for receiving washing liquid, the tub having a drain opening, the drain opening being fluidically connected to a line, with a variable-speed pump in the line for pumping washing liquid from the tub and is arranged through the line, and a controller for controlling the variable-speed pump is released, the controller being designed to activate the variable-speed pump during a first period of time and to operate it at a nominal pump speed in order to displace washing liquid with a nominal volume flow from the tub and through the To pump out line, the controller being designed to reduce the nominal pumping speed of the variable-speed pump to a minimum pumping speed during a second time section following the first time section, if the volume flow rate is the dur The washing liquid pumped by the variable-speed pump falls below a minimum volume flow threshold, the control being designed to increase the minimum pumping speed of the variable-speed pump to a maximum pump speed during a third time segment following the second time segment when the volume flow of the washing liquid pumped by the variable-speed
  • the pump can suck in air when the level of the washing liquid in the suds container drops, as a result of which there is a break in the volume flow of the washing liquid conveyed by the pump.
  • the ventilated pump must displace the air from the pump both on the suction side and on the pressure side so that the nominal volume flow can be set again.
  • This air displacement process and thus the renewed formation of the nominal volume flow can often only occur with a time delay because a standing circulation vortex, which is induced by the impeller rotation and which has low core pressures due to the high circumferential velocities, forms at the pump suction mouth in the suction-side, central and axial pump impeller inflow within the pump so that the air dissolved in the flow centers around the vortex center axis.
  • the standing vortex collects the air on the suction side and thus blocks the renewed flow of the washing liquid at the suction mouth of the pump.
  • the result is a build-up of the washing liquid thrown free on the suction side, so that the washing liquid residues high in washing liquid levels in the tub at which the rotating laundry drum can immerse in the washing liquid, which increases the motor torque of a drum drive excessively, so that the spinning process may have to be interrupted.
  • the control system detects the presence of an air vortex in the pump in that the volume flow falls below a volume flow minimum threshold value.
  • the control reacts to the drop in volume flow by reducing the nominal pumping speed of the pump to the minimum pumping speed and then increasing the minimum pumping speed to the maximum pumping speed. This means that the standing air vortex induced on the suction side collapses in front of the impeller in the pump, the air is sucked into the pressure chamber of the pump and then the air is pumped out with a faster increasing volume flow of the pumped washing liquid from the pump and through the line.
  • the two-phase mixture in the pump pressure chamber in which the different phase components are homogeneously distributed and therefore not yet present as two separate phases as at the pump suction mouth, can initially be pumped out by the abrupt change in speed.
  • the nominal volume flow is set again relatively quickly and the pump can be operated again at the nominal pump speed, which has been reduced again.
  • the rapid removal of the vortex of air from the pump can prevent a significant collapse in the volume flow of the pumped washing liquid and a backflow of washing liquid caused by this in the tub. This prevents the rotating laundry drum from dipping into the back-up washing liquid in the tub, foaming the washing liquid, making it more difficult to pump the washing liquid out of the tub and increasing the drum drive torque, which not only reduces the service life of the drum motor, but also the whole Device load, such as Bearings, springs, dampers or the entire oscillation system are reinforced.
  • the controller can determine the operating state of the pump through the electrical power requirement of the variable-speed pump, in particular through the torque-generating current.
  • the control can, for example, determine a drop in the volume flow of the washing liquid conveyed by the pump in that the torque-generating flow applied to the pump drops.
  • a laundry care device is understood to mean a device which is used for laundry care, e.g. a washing machine or tumble dryer.
  • a laundry care device is understood to mean a household laundry care device. So a laundry care device, which is used in the context of housekeeping, and with which laundry is treated in household quantities.
  • control is designed to increase the minimum pumping speed of the variable-speed pump at the beginning of the third time segment without a time delay after the end of the second time segment to increase the maximum pumping speed, or is that the controller is designed to increase the minimum pumping speed of the variable-speed pump to the maximum pumping speed after the end of the second time segment after an intermediate time interval during the third time segment, the intermediate time interval being in particular between 1 second and 5 seconds.
  • the intermediate time interval can in particular be between 1 second and 5 seconds or can be longer if there is not yet a sufficient amount of lye residue accumulated on the suction side, which is sufficient for the volume flow to reach the minimum volume flow threshold.
  • the laundry care device comprises a program selection device for selecting a laundry care program and / or a weight detection device for detecting a weight of laundry in a laundry drum of the laundry care device, the control being designed to determine the duration of the intermediate time interval as a function of the selected laundry care program and / or to determine the detected weight of the laundry, and / or wherein the controller is designed to adapt the speed profile of the variable-speed pump as a function of the selected laundry care program and / or the detected weight of the laundry.
  • control can advantageously adapt the duration of the intermediate time interval and / or the speed profile of the variable-speed pump to the amount of washing liquid pumped out.
  • variable-speed pump comprises an electric motor, in particular a permanently excited brushless synchronous drive.
  • the laundry care device has a power detection element for detecting an electrical power value of the variable-speed pump, the controller being designed to reduce the nominal pump speed of the variable-speed pump to the minimum pump speed during the second time segment when the detected electrical power value has a minimum reference power value falls below, wherein the minimum reference power value corresponds to an electrical power value of the variable-speed pump when pumping washing liquid with the minimum volume flow threshold value.
  • control detects a drop in the volume flow of the washing liquid conveyed by the pump in that the electrical power value of the pump also drops.
  • the control can determine that the volume flow of the conveyed washing liquid falls below the volume flow minimum threshold value when the recorded electrical power value falls below the minimum reference power value, whereby the occurrence of an air vortex in the pump can be detected .
  • the controller is designed to set the minimum pumping speed of the variable-speed pump to the To increase the maximum pumping speed during the third time segment when the detected electrical power value reaches the minimum reference power value.
  • control detects a renewed increase in the volume flow to the minimum volume flow threshold value of the washing liquid delivered by the pump from the fact that the electrical power value correlated with the volume flow again reaches the minimum reference power value during the third time segment.
  • the controller is designed to reduce the maximum pumping speed of the variable-speed pump to the nominal pumping speed during the fourth time segment when the detected electrical power value reaches a nominal reference power value, the nominal reference power value being an electrical power value of the variable-speed pump when pumping out washing liquid corresponds to the nominal volume flow.
  • control recognizes a change in the volume flow of the washing liquid conveyed by the pump in that the electrical power value of the pump also changes.
  • control can recognize when the recorded electrical power value reaches or exceeds the nominal reference power value that the volume flow of the conveyed washing liquid has reached or exceeds the nominal volume flow, which means that a Air vortex can be detected in the pump.
  • it can be recognized in this way whether there is again a backwater amount of washing liquid on the suction side, which the pump only pumps out with a considerable delay due to the presence of the standing vortex in the flow to the pump impeller.
  • the power detection element comprises a power sensor for detecting electrical power of the variable-speed pump and / or a current sensor for detecting a supply current of the variable-speed pump.
  • the laundry care device has a flow sensor for detecting a flow speed of the washing liquid pumped out by the variable-speed pump, the control being designed to reduce the nominal pump speed of the variable-speed pump to the minimum pumping speed during the second time segment when the detected flow speed falls below a reference flow rate value, and wherein the controller is designed to increase the minimum pumping speed during the third time segment to the maximum pumping speed when the detected flow rate reaches the reference flow rate value, the reference flow rate value corresponding to a flow rate value of the washing liquid when pumping out washing liquid with the volume flow minimum threshold value.
  • control detects a change in the volume flow of the washing liquid conveyed by the pump in that the flow speed of the washing liquid conveyed by the pump also changes.
  • the laundry care device has a level sensor for detecting a level of washing liquid in the tub, the control is designed to reduce the nominal pumping speed to the minimum pumping speed during the second time segment when the detected level falls below a minimum level, and is the controller is designed to increase the minimum pumping speed to the maximum pumping speed during the third time segment when the detected level reaches the minimum level again.
  • the laundry care device has an inlet nozzle for introducing washing liquid into the tub, the drain opening of the tub is fluidly connected to the inlet nozzle through the line, and the variable-speed pump is designed to deliver washing liquid through the drain opening Pump out the tub in the tub and pump the pumped out washing liquid through the tub and through the inlet nozzle back into the tub.
  • the controller is designed to control the variable-speed pump during the first, second, third and fourth time segments during a spinning process carried out by the laundry care device.
  • the object according to the invention is achieved by a method for pumping washing liquid from a tub of a laundry care device, the laundry care device having a tub for receiving washing liquid, the tub having a drain opening, the drain opening being fluidically connected to a line, wherein in the line a variable speed pump for pumping washing liquid from the tub and disposed through the conduit and having a controller for controlling the variable speed pump, the method comprising the steps of; Activating the variable-speed pump and operating the variable-speed pump at a nominal pumping speed by the controller during a first period of time in order to pump washing liquid out of the tub and through the line at a nominal volume flow rate; Reducing the nominal pumping speed of the variable-speed pump to a minimum pumping speed by the control during a second time segment following the first time segment, if the volume flow of the washing liquid pumped by the variable-speed pump falls below a minimum volume flow threshold, increasing the minimum pumping speed to the maximum pumping speed by the control during an on the second time segment followed by the third time
  • the laundry care device has a power detection element for detecting an electrical power value of the variable-speed pump
  • the method comprises the following steps, reducing the nominal pump speed of the variable-speed pump to the minimum pump speed by the control during the second time segment, if the detected electrical power value falls below a minimum reference power value, wherein the minimum reference power value corresponds to an electrical power value of the variable-speed pump when pumping washing liquid with the volume flow minimum threshold value, increasing the minimum pumping speed to the maximum pumping speed by the control during the third time segment, when the detected electrical power value reaches the minimum reference power value, reducing the maximum pumping speed to the nominal pumping speed by the controller during the fourth time segment when the detected electrical power value reaches a nominal reference power value, the nominal reference power value corresponding to an electrical power value of the variable-speed pump when pumping out washing liquid with the nominal volume flow.
  • volume flow of the washing liquid conveyed by the pump can be determined particularly advantageously by detecting an electrical power value of the variable-speed pump, whereby an effective removal of air eddies from the pump can be ensured.
  • the increase of the minimum pump speed to the maximum pump speed is carried out without a time delay after the reduction of the nominal pump speed to the minimum pump speed, or the method comprises an intermediate time interval between the reduction of the nominal pump speed to the minimum pump speed and the increase of the minimum pump speed to the maximum pump speed, wherein the intermediate time interval is in particular between 1 second and 5 seconds.
  • the intermediate time interval can in particular be between 1 second and 5 seconds or can be longer if the suction side has not yet accumulated a sufficient amount of lye residue that is sufficient for the volume flow to reach the minimum volume flow threshold.
  • FIG. 11 shows a schematic view of a general laundry care device 100, such as a washing machine.
  • the laundry care device 100 comprises a rinsing bowl 101 into which detergent or other liquid substances can be filled.
  • the laundry care device 100 comprises a door 103 for loading the laundry care device 100 with laundry.
  • Fig. 2 shows a schematic view of a pumping system of a laundry care device with a variable-speed pump.
  • the laundry care device 100 has a tub 105 for receiving washing liquid, and has a laundry drum 107 for receiving laundry.
  • the laundry drum 107 has an underside 109 of the drum.
  • the tub 105 has a drain opening 111.
  • the laundry care device 100 has an inlet nozzle 113.
  • the discharge opening 111 is fluidically connected to the inlet nozzle 113 by a line 115, a variable-speed pump 117 for pumping washing liquid through the line 115 being arranged in the line 115.
  • the variable speed pump 117 can wash liquid through the drain opening 111 from the tub 105 during an in Fig.
  • the laundry care device 100 further comprises a controller 119, which is connected to the variable-speed pump 117 by a first control connection 121, and which is connected to a power detection element 123 by a second control connection 125, the power detection element 123 to the variable-speed pump 117 by a third control connection 127 is connected.
  • the power detection element 123 detects an electrical power value of the variable-speed pump 117, the detected electrical power value corresponding to a volume flow of the washing liquid delivered by the variable-speed pump 117.
  • the controller 119 is designed to control the pump speed of the variable-speed pump 117 as a function of the detected electrical power value of the variable-speed pump 117.
  • the laundry care device 100 further comprises an outlet line 129 which is fluidically connected to the line 115.
  • the variable speed pump 117 is formed during an in Fig. 2
  • the pumping process (not shown) is used to pump out washing liquid through the drain opening 111 from the tub 105, through the line 115 and through the outlet line 129 from the laundry care device 100.
  • a laundry care device 100 does not necessarily have to have a pumping over system, but the variable-speed pump 117 can also be arranged in a laundry care device 100 without a pumping over system, in which case the line 115 only fluidly connects the tub 105 with the pump 117 and the Line 115 is not led from the pump 117 to the inlet nozzle 113 of the laundry care device 100.
  • Fig. 3 shows a graphic representation of a conventional pumping process in a laundry care appliance.
  • Fig. 3 shows a time representation of a normalized pump speed of a variable-speed pump 117 and the scaled volume flow of the washing liquid delivered by the variable-speed pump 117, all of which are plotted along the axis of ordinate 131 as a function of the time in seconds, which is indicated along the axis of abscissa 133.
  • the first curve 135 shows the course of the normalized pump speed of a variable-speed pump 117.
  • the second curve 137 shows the course of the scaled volume flow of the washing liquid conveyed by the variable-speed pump 117.
  • variable-speed pump 117 can thus be operated continuously at a nominal pumping speed 141 during the first pumping interval 139 without the volume flow of the washing liquid tearing off, as can be seen from the course of the second curve 137 during the first pumping interval 139, since here a constant nominal volume flow 143 is retained. If the variable-speed pump 117 is deactivated at the end of the first pumping interval 139, the volume flow of the washing liquid delivered by the variable-speed pump 117 also falls to zero. It is emphasized that the activation or deactivation of the variable-speed pump 117 by the controller 119 leads to a time-delayed increase or decrease in the volume flow of the pumped washing liquid.
  • variable-speed pump 117 is operated at the nominal pump speed 141 during the second pumping interval 145, the volume flow of the washing liquid is interrupted, since air from the tub 105 penetrates into the variable-speed pump 117. As a result, the nominal volume flow 143 drops abruptly during the second pumping interval 145.
  • the ventilated pump 117 must remove the air from the pump 117 both on the suction side and on the also displace on the pressure side, so that the nominal volume flow 143 can be set again when the suction side of the pump 117 has again accumulated a backlog of the washing liquid to be pumped off.
  • the volume flow increases only slowly during the second pumping interval 145 until the nominal volume flow 143 is reached again. For this reason, procedural possibilities are being sought to realize the fastest possible pump restart when there is a residual amount of washing liquid.
  • Fig. 4 shows a graphic representation of a pumping process in a laundry care device according to a first embodiment. Analogous to Fig. 3 show the Fig. 4 also a time representation of a normalized pump speed of a variable-speed pump 117 and the scaled volume flow of the washing liquid conveyed by the variable-speed pump 117, all of which are plotted along the axis of ordinate 131 as a function of the time in seconds, which is indicated along the axis of abscissa 133.
  • the first curve 135 shows the course of the normalized pump speed of a variable-speed pump 117.
  • the second curve 137 shows the course of the scaled Volume flow of the washing liquid conveyed by the variable-speed pump 117.
  • variable-speed pump 117 can be operated continuously with a nominal pump speed 141 and with a nominal volumetric flow 143 during a first pumping interval 139 without the volumetric flow of the washing liquid tearing off, since a sufficient amount of washing liquid is available in the tub 105.
  • the second pumping interval 145 is divided into a first time segment 147, a second time segment 149, a third time segment 151 and a fourth time segment 153.
  • variable-speed pump 117 is operated at a nominal pump speed 141, so that a nominal volume flow 143 is established.
  • air is sucked in from the tub 105 by the pump 117, as a result of which the volumetric flow of the washing liquid conveyed drops.
  • the controller 119 reduces the nominal pumping speed 141 of the pump 117 to a minimum pumping speed 155 when the volume flow of the washing liquid pumped by the pump 117 falls below a volume flow minimum threshold value 157.
  • the speed-variable pump 117 has a speed-flexible, permanently excited synchronous motor, whereby the current pump status of the pump 117 can be recognized by the detection of the operating parameters. It can thus be detected whether the pump 117 is pumping the full volume flow within the framework of the nominal pump speed 141 or has, for example, sucked in air, the flow has been interrupted and the pump 117 has only built up a pressure column and is thus in the so-called "snorkel” or “slurp” Operation "and falls below the minimum volume flow threshold value 157. This is because for these different operating states there is also a different power requirement of the pump 117 one that can be detected via a different motor torque and thus a different torque-generating current I q .
  • the controller 119 increases the minimum pumping speed 155 of the pump 117 to a maximum pumping speed 159 when the volume flow of the pumped washing liquid again reaches the volume flow minimum threshold value 157.
  • the maximum pump speed 159 here is greater than the minimum pump speed 155 and the nominal pump speed 141 of the pump 117 in order to effectively remove an air vortex in the pump 117.
  • the controller 119 reduces the maximum pumping speed 159 of the pump 117 again to the nominal pumping speed 141 of the pump 117 when the volume flow of the washing liquid pumped by the variable-speed pump 117 again reaches the nominal volume flow 143, whereby the Washing liquid can be effectively and effectively pumped out of the tub 105 of the laundry care device 100.
  • the problem with pumping described here does not only arise in a spinning process, but can also occur in the washing process, in which a pumping system is often used in large-volume laundry care devices 100 in order to accelerate the laundry wetting process and to optimize the washing process in terms of process technology.
  • the amount of residual water is returned to the laundry with the aid of a pump over a pressure-side circulation hose via an inlet nozzle 113.
  • the task of realizing the rapid restart of the pump after a disrupted flow rate when the amount of residual water accumulates results.
  • Fig. 5 shows a schematic representation of a method for pumping washing liquid from a tub of a laundry care device.
  • the method 200 comprises, as a first method step, activating 201 the variable-speed pump 117 and operating the variable-speed pump 117 at a nominal pump speed 141 by the controller 119 during a first time segment 147 in order to pump washing liquid with a nominal volume flow 143 out of the tub 105 and through the line 115 .
  • the method 200 comprises, as a second method step, reducing 203 the nominal pump speed 141 of the variable-speed pump 117 to one Minimum pump speed 155 by the controller 119 during a second time segment 149 following the first time segment 147, when the volume flow of the washing liquid pumped by the variable-speed pump 117 falls below a volume flow minimum threshold value 157.
  • the method 200 comprises, as a third method step, the increase 205 of the minimum pump speed 155 to the maximum pump speed 159 by the controller 119 during a third time segment 151 following the second time segment 149, when the volume flow of the washing liquid pumped by the variable-speed pump 117 reaches the volume flow minimum threshold value 157, wherein the maximum pumping speed 159 is greater than the minimum pumping speed 155 and the nominal pumping speed 141 to remove an air vortex in the variable speed pump 117.
  • the method 200 comprises, as a fourth method step, reducing 207 the maximum pumping speed 159 of the variable-speed pump 117 to the nominal pumping speed 141 by the controller 119 during a fourth time segment 153 following the third time segment 151 when the volume flow of the washing liquid pumped by the variable-speed pump 117 is reduced Nominal volume flow 143 reached in order to effectively pump washing liquid again with the nominal volume flow 143 out of the tub 105 and through the line 115.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)
  • Washing And Drying Of Tableware (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP18150541.3A 2017-01-23 2018-01-08 Wäschepflegegerät mit einer steuerung Active EP3351674B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102017201008.8A DE102017201008B3 (de) 2017-01-23 2017-01-23 Wäschepflegegerät mit einer Steuerung

Publications (2)

Publication Number Publication Date
EP3351674A1 EP3351674A1 (de) 2018-07-25
EP3351674B1 true EP3351674B1 (de) 2020-09-23

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EP (1) EP3351674B1 (zh)
CN (1) CN108342877B (zh)
DE (1) DE102017201008B3 (zh)

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KR102669131B1 (ko) * 2018-07-06 2024-05-23 엘지전자 주식회사 순환펌프 구동장치 및 세탁물 처리기기
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